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Astron. Astrophys. 334, 840-844 (1998)

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Apsidal motion in the eclipsing binaries V1136 Cygni, ES Lacertae, MZ Lacertae and EQ Vulpeculae

Marek Wolf 1, Roger Diethelm 2, Valentina S. Kozyreva 3 and Lenka arounová 4

1 Astronomical Institute, Charles University Prague, V Holeovikách 2, CZ-180 00 Praha 8, Czech Republic (wolf@mbox.cesnet.cz)
2 Astronomical Institute, University of Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland (diethelm@astro.unibas.ch)
3 Sternberg Astronomical Institute, State University Moscow, University Avenue 13, Moscow 119899, Russia
4 Astronomical Institute, Czech Academy of Sciences, CZ-251 65 Ondejov, Czech Republic

Received 21 January 1998 / Accepted 5 March 1998


About thirty new times of minimum light recorded with photoelectric means have been gathered for the early-type eccentric eclipsing binaries V1136 Cyg ([FORMULA]), ES Lac ([FORMULA]), MZ Lac ([FORMULA]) and EQ Vul ([FORMULA]). The [FORMULA] diagrams are analyzed using all reliable timings found in the literature and new values for the elements of the apsidal motion are computed. We find new periods of apsidal motion of about 520, 300, 440 and 2200 years for V1136 Cyg, ES Lac, MZ Lac and EQ Vul, respectively.

Key words: stars: binaries: eclipsing – stars: individual: V1136 Cyg, ES Lac, MZ Lac, EQ Vul – stars: fundamental parameters

Send offprint requests to: M. Wolf

© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998